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Warning: Muli question post.
#1 FNG here, so thank you all for your input ahead of time.
#2: Anyone here have any experience with Intellihot combi boilers?
I have a very ancient gas boiler heating my 2000sqft home with baseboard hot water radiators. Currently its vented through the chimney, i would like to replace it with a direct vent unit out the side of the house so i can demo and roof over the chimney. Im in the Denver area, so cold winters and warm summers. I would like a combination boiler-DHW as either tankless or boiler with indirect. Im not married to high efficiency but rather durable, cost effective, and does what it should - provide hot water when needed. Would not want to worry about showering during laundry, etc.
So far Ive got bids for Navien ncb-210 and Intellihot combi (both tankless obviously). Although I like the advertised efficiency of a mod-con Im a little worried about the practicality of tankless. That said the Navien bid includes a buffer tank. I like that both units are "smart" and performance can be monitored with a smartphone app. Navien reviews across the web seem to be poor. Very little information about Intellihot, but the contractor speaks highly of his home unit.
#3: Should I consider a different setup? Boiler w/indirect DHW heat? If so, suggested brand/model?